Browsing by Author "Li, Meng"

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    Electrical and optical characterization of colloidal silicon nanocrystals
    (2013-12) Li, Meng
    Colloidal silicon nanocrystals (SiNCs), due to their high photoluminescence efficiency and tunable bandgap, can be used to fabricate highly efficient hybrid nanocrystal-organic light-emitting-devices (NC-OLEDs) that emit in red or near infrared spectrum. Despite reports of outstanding device performance, the underlying mechanism of this high efficiency remains unknown. Consequently, this thesis focuses on studying the electrical and optical properties of SiNCs. The electrical conductivity and mobility of electrons and holes are successfully extracted in order to explain the observed dependence of device efficiency on SiNC surface ligand coverage. Steady-state and transient photoluminescence is also examined to better understand the connection between surface ligand coverage and molecular photophysics. In addition, these measurements are used to better understand the mechanisms for non-radiative exciton decay in SiNCs. This work elucidates the relationship between SiNC properties and device performance, potentially guiding the design of future NC materials for high performance.
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    Every Voice Matters: Citizen Engagement Plan
    (Resilient Communities Project (RCP), University of Minnesota, 2017) DesRoches, Chris; Kartheiser, Chris; Kutcher, Rachel; Li, Meng; Sherlock, Reed; Yoder, Amy
    This project was completed as part of the 2017-2018 Resilient Communities Project (rcp.umn.edu) partnership with the City of Ramsey. In 2006, the City of Ramsey embarked on a major overhaul of how it approaches public participation through a grass roots public engagement effort known as Ramsey3. Although the City has made great strides in engaging with residents about land use decisions, street reconstruction projects, and project proposal reviews, a biannual citywide survey suggests that residents would like additional civic and volunteer opportunities to get involved in their community on other issues. Students in Dr. Dan Milz’s Planning and Participation Processes class evaluated the city’s current engagement methods, identified guiding principles for effective public engagement through a literature review and case studies, identified a range of engagement methods and tools for the City to consider, and offered recommendations for the City going forward. A final report and poster are available.